Micro Hardware in The Loop (Mhíl) is an electromechanical device that allows you to run the tests on overall electronic control units. Depending on the desired system, it is connected to a control unit: it can be connected to the engine control unit or any other unit in this machine. The solution must be ‘costumizzata’ for the type of electronic control units to be tested. The system makes a series of ‘testing over loop’ and focuses in particular on the non-regression tests: the test not only serves to confirm that the strategy implemented functions properly but also to check the functioning of the surrounding context, checking that there are no regressions compared to previous versions.
The simulator is made in Netcom laboratories: software created records a maneuver made in the car and on the power play; this action generates the commands and the information derived from it are re-recorded. There is a system of departure: a recorded maneuver comes to the control unit processing only if reference comparable values coincide. If this is so it means that the test has been successful otherwise it proceeds with verification.
The system hardware consists of three parts: the generator, the control unit, and a plate loads (actuators connected to the control unit).
Mhíl is used for ‘testing over loop’ of the general control units, for both automotive and other electronic cards: software sends data generating actions, these in turn are recorded and compared. A product used by the Fiat / Marelli: properly ‘customized’ is currently in Brazil and in Italy (Turin).
Transactions with the Mhíl can be implemented with the HIL (Hardware in the Loop). The difference is in terms of cost: the HIL simulator is worth three times the Mhíl, a company interested in “test closed loop” system chooses a Mhíl to optimize costs. HIL with the “closed loop” simulator follows a mathematical model. For example, a motor connected to the control unit sends the real inputs that it receives by generating in turn the outputs, the information returns to the simulator that transfers it to the model. If there is a pattern of Mhíl but a maneuver recorded in the car that is processed, it generates the input in the control unit, the control unit receives, processes and provides information on the actions: so unlike dell’HIL is a path that goes only one direction and makes a lower number of test.